Method and device for extracting clock from active module of transponder

Abstract

The invention discloses a method and device for extracting a clock of an active module of a transponder. The method comprises the following steps: obtaining an original DBPL code and obtaining a delayed DBPL code; performing an XOR operation on the original DBPL code and the delayed DBPL code to form a DBPL code Pulse signal, extract rising edge and falling edge information to form edge detection pulse signal; perform non-retriggerable pulse extension and retriggerable pulse extension on edge detection pulse signal respectively to form monostable signal S_A and monostable signal S_B ;Triggered by the falling edge of the monostable signal S_A, the clock signal CLK_A is generated; triggered by the falling edge of the monostable signal S_B, the clock signal CLK_B is generated; the clock signal CLK_A and the clock signal CLK_B are ORed to form a duty cycle of 50% uniform clock signal CLK. The invention improves the stability and anti-interference ability of the transponder.

Description

technical field [0001] The invention belongs to the technical field of DBPL decoding, and in particular relates to a method and device for extracting a transponder active module clock. Background technique [0002] The transponder in the railway system is a point device that uses electromagnetic induction technology to transmit information from the ground to the train. It can be divided into active modules and passive modules. information, passive modules provide fixed information. These information include signal data, control data, location and geographic information, train target operation information, route information, line speed and temporary speed limit and other information. With the continuous improvement of train speed, transponder has become an important basic equipment in the high-speed train control system. [0003] During the running of the train, the active module needs to update the messages stored in it in real time with the connected ground electronic uni...

AI Technical Summary

Problems solved by technology

[0005] However, the method of extracting the clock signal from DBPL decoding in the prior art has high complexity, resulting in low stability and anti-interference ability of the transponder

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